I don't have access to 10-9S for CYYZ. Perhaps a company chart?
Anyway, on chart 11-1A you have a CAT IIIA (Fail Operational) approach with a a RVR 6 as you stated. Chart 10-9S perhaps depicts specific company requirements where as you have the CAT IIIA - Fail Passive minima of RA50. As for the RVR 7, then again it is perhaps a company decision to increased in order to be conservative.
As I see it, you should refer to the RVR 6 requirement if operating Fail Operational. You should apply a minima of RA 50 - RVR 7 when operating Fail Passive .
A flight control system is fail-operational if, in the event of a failure below alert height (AH), the approach, flare and landing, can be completed automatically. In the event of a failure, the automatic
landing system will operate as a fail-passive system.
A flight control system is fail-passive if, in the event of a failure, there is no significant out-of-trim condition or deviation of flight path or attitude but the landing is not completed automatically. For a fail-passive automatic flight control system the pilot assumes control of the aeroplane after a failure.
I hope it helps somehow.
Last edited by Jetdriver; 9th June 2013 at 22:18.